TSX L4-2.4L (2005)
Keyless Entry: Description and Operation
Circuit Description
Power Door Locks/Keyless Entry/Security Alarm
How the Circuit Works
The power door locks, keyless entry, and the security alarm system are part of the multiplex integrated control system. The use of multiplexing
incorporates all three systems together The following multiplex control units operate the systems:
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Door multiplex control unit
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Gauge control module
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Multiplex integrated control unit (MICU)
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Relay control module
Power Supply
With the ignition switch in the ON (II) or START (III) position, battery voltage is applied through fuse 21 to the MICU and to the door multiplex control
unit. Fuse 21 and the MICU are located in the under-dash fuse/relay box.
Fuse 7, located in the under-hood fuse/relay box, is hot at all times and supplies battery voltage to the relay control module.
Fuse 7, located in the under-dash fuse/relay box, is hot at all times and supplies battery voltage to the MICU, the door multiplex control unit, and the
gauge control module.
Fuse 8, located in the under-dash fuse/relay box, is hot at all times and supplies battery voltage to the MICU.
Fuse 27, also located in the under-dash fuse/relay box is hot at all times and supplies battery voltage to the door multiplex control unit.
System Description
Door Locks (switch operation)
The driver's door lock switch is part of the door multiplex control unit. The door multiplex control unit is located within the power window master
switch. All lock and unlock commands from this switch are communicated across the multiplex communication line to the MICU.
The following lock or unlock control signals are also communicated to the MICU.
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Front passenger's door lock switch
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Door lock knob switches
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Driver's key cylinder switch
According to the switch request, the MICU directly operates the power supply and the grounding signals to the reversible electric door lock motors for
lock and unlock modes.
Inserting the key into the driver's key cylinder switch and turning the key one time will unlock the driver's door. Turning the key a second time will
unlock all the doors. This is a multiplex controlled response.
Locking the doors from the driver's door switch will lock all the doors.
Door Locks (keyless transmitter operation)
The doors can be locked or unlocked from the hand-held keyless transmitter. The receiver antenna for the keyless system is located in the power window
master switch (door multiplex control unit).
All lock and unlock commands from the keyless transmitter are communicated across the multiplex communication line to the MICU.
According to the request, the MICU directly operates the power supply and the grounding signals to the reversible electric door lock motors for lock and
unlock modes.
Pressing the unlock button one time will unlock the driver's door. Pressing the unlock button a second time will unlock all the doors. This is a multiplex
controlled response.
Pressing the lock button of the remote transmitter will lock all the doors, and set the security system.
Security
The security system is incorporated with the power door locks. When the vehicle is locked with the door key, lock knob, door lock switch, or the remote
